Welcome to the forum, which, in my view, is one of the best motorcycle forums on the net.
Start with the battery. Whether or not you are having difficulties charging, take it to a local shop, you should be able to get it load tested for free. Don't worry about the choke. When you say a black tar, do you mean an oil stain?
Others more knowledgeable will be along to assist further.
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"It begins here for me on this road. How the whole mess happened I don't know, but I know it couldn't happen again in a million years."
(Johnny Strabbler-The Wild One 1953)
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